Reversible electrochemical mirror (REM) electrochromic devices based on reversible metal electrodeposition are exciting alternatives compared with conventional electrochromic because they offer electrochemical tunability in multiple optical states, long durability, and high contrast. Different from conventional electrochromic materials, of which the color change depends on the intercalation/deintercalation of ions into electrochromic films, the change in the optical states of REMs is based on the reversible electrodeposition and dissolution of metal. In this study, a REM electrochromic device with a Cu hybrid electrolyte composed of aqueous and nonaqueous components is proposed, which serves as an electrolyte reservoir that hosts Cu ions for reversible electrodeposition/dissolution. The hybrid electrolyte promotes the electrochemical reversibility of the Cu redox, an enhanced electrochromic performance, and a robust cycling stability of 5000 cycles (minor degradation of 4.71%). The investigation of the discharging/charging of the Cu hybrid REM device reveals that the Cl^–/ClO^– redox mechanism occurs at the cathode. Finally, an unprecedented dual-functional Cu hybrid REM energy storage device has been realized.

中文翻译：

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通过可逆金属电沉积实现稳健的三光态电致变色储能装置

与传统电致变色器件相比，基于可逆金属电沉积的可逆电化学镜 (REM) 电致变色器件是令人兴奋的替代方案，因为它们在多种光学状态下提供电化学可调性、耐用性和高对比度。不同于传统的电致变色材料，其颜色变化取决于离子嵌入/脱嵌到电致变色薄膜中，REMs 光学状态的变化基于金属的可逆电沉积和溶解。在这项研究中，提出了一种 REM 电致变色装置，其具有由水性和非水性成分组成的 Cu 混合电解质，可作为电解质储库，容纳 Cu 离子进行可逆电沉积/溶解。混合电解质促进了 Cu 氧化还原的电化学可逆性、增强的电致变色性能和 5000 次循环的稳健循环稳定性（4.71% 的轻微降解）。对 Cu 混合 REM 器件的放电/充电的研究表明，Cl^– /ClO ^–氧化还原机制发生在阴极。最后，实现了前所未有的双功能铜混合 REM 储能装置。